Cinematograph and photographic color film material



Aug. 7, 1928.

J. E. THORNTON CINEMATOGRAPH AND PHOTOGRAPHIC COLOR FILM MATERIAL Filed oct. a, 1925 ,--ussrnA-run CoLLmo LAYER TRANsPARcNT Suppen-r SussrRA-rum TRANsPARaN-r SuPFoe-r Camela LAYER SuBsTwA-rum TRANSPARLNT SuPPoRT (Caudan: SATURATeD `L Wam Comm SUBSTRATUM TRANsPARaN-r Supl-cm1- TnANsPARnNr Surfeur SUBSTRATUM Comano LAYen (g1/wanten@ Jo/'z Eder/ana map/170m @Hozwm Patented Aug. 7, 1928.

VUNITED STATES JOHN EDWARD THOI/tNTON, OF WEST HAMPSTEAD, LONDON, ENGLAND.

CINEMATOGRAPH AND PHOTOGRAPHIC COLOR FILM MATERIAL.

Application led October 3, 1925, Serial No. 60,349, and in Great Britain November 3, 1924.

This invention relates to the manufacture of multi-color film-material for the production of cinematograph or otherform of photographic films of the type described in my U. S. Patent No. 1,635,516 dated July 12, 1927, and in my application for U. S. Patent, Serial No. 711,255 filed May 5, 1924, and in British Patents No. 214,934 dated December 27, 1922 and No. 233,985 dated November 3, 1924, in which the film-material is formed with differently-colored stripes side-by-side.

Hitherto such ilms have been constructed by applying differently-colored colloid emulsions in side-by-side stripes to a base or support of Celluloid or the like and it has been found difficult to so adjust the coating machinery as to ensure exactly the same thickness of emulsion and therefore equal density of the dierent colors when using a separate coating roll for each stripe.

By the present invention this difficulty 1s overcome, and even results are produced, with less labour and attention.

In the accompanying drawings:

Fig. 1 is a sectional view of a transparent support having a layer of adhesive substratum applied theretoand illustrating the first step in the production of the film.

Figs. 2, 3 and 4 are views similar to Fig. 1 illust-rating the second, third and fourth steps in the production of the iilm.

Fig. 5 is a plan view of a portion of the finished film; and

Fig. 6 is a sectional view of an apparatus suitable for use in applying the-stripes of color to the colloid layer on the transparent support.

The film-material is preferably formed as a very wide web and afterwards slit into multi-color strips of the desired width.

The base or support consists of Celluloid, cellulose-acetate or other suitable transparent waterproof material, or it may be gelatine, paper or other material.

The base is coated all over by means of standard coating machinery with a layer of adhesive substratum of the usual known types and upon the substratum a layer of colloid. such as gelatine, albumen or fish glue having one even thickness throughout. The colloid may have its sensitizer incorporated tlierewith before coating or it may be applied afterwards. For example, where silverbromide is used it is formed into a sensitive emulsion by incorporation with gelatine as the colloid in the usual way. But if the sensitizer consists of a bichromatc salt, iron salt, or other substance not usually made up into elnulsion form, it is preferred to coat the support all over with the colloid such as gelatine, albumen, or iish glue, dry the layer, and afterwards apply the sensitizer thereto by any of the known methods.

The dyes or liquid colors are made up into solutions of the requisite strength` and are.

to a definite strength, and then applying each colored-solution to the web for a suficient time to ensure complete saturation of the colloid layer through its total thickness over the width of each stripe. When the full quantity of color has been absorbed by the v colloid the latter is then dried, after which the web is slit up into narrow strips, each containing two, three, four or other number M of diierently colored stripes side-by-side.

Any required variations in density of coloring may be made by suitable adjustments in strength of the coloring solutions.

Any mordant suitable to the particular dye or color colloid is`used for fixing the colors, which mordant may, in the case of some dyes, be incorporated in the coloring solutions, but in most cases it will be preerred to fix the colors by applying a mordant to the entire width of web after the strlpes of colors have been first applied and dried.

Vhere it is desired to more accurately limit the flow of the dyes and absorption by the colloid in the lateral direction in order to ensure sharper edges or limit to each Width of color, a hardening solution or a mordanting solution may first be applied to the web in the form of border stripes in the margins between the colored stripes, such lines of solution being absorbed by the col loid and dried before the colors of the stripes are applied, the hardened or mordanted, borders limiting any flow or absorption of colors in those directions.

What I claim as my invention and desire to protect by Letters Patent is 1. A multi-colored positive film-material comprising a web of cellulosic base material, an adhesive substratum over the entire width of said web, an even layer of colloid over the entire width of the substratum, a plurality of narrow border stripes at intervals on said layer of colloid, and a plurality of colored stripes absorbed in the eolloid layer between saidv border stripes.

comprising a web of cellulosic base material, an adhesive substratum over the entire width of said web, an even layer of colloid over the entire width of said substratum, a plurality of narrow border stripes at intervals on said layer of colloid, a plurality of colored stripes absorbed in the eolloid layer between1 said border stripes, and a layer of mordant over the entire Width of said web.

3. A. multi-colored positive film-material, comprising a web of cellulosio base material, an adhesive substratuln over the entirewidth of said web, an even layer of colloid over the entire width of said subs'tratum, a plurality of narrow border stripes at intervals on said 2. 'A multi-colored positive lm material,

layer of colloid, a plurality of colored stripes absorbed to saturation point in th colloid layer between said border stripes, and a layer of mordant over the entire width of said web. In testimony whereof I have hereunto set my hand.

JOHN EDWARD THORNTON. 

